As YouTube turns ten, we chart the history of the last decade through the lens of the world's most famous video sharing site. It's the human story of those who created it, the stars it gave birth to, and the countries whose fates it changed. On April 23, 2005 the first YouTube video, "Meet Me at the Zoo," featuring co-founder Jawed Karim, was uploaded.

Ketamine chemically, a compound called Ketamine hydrochloride is a drug that was developed in the 1960s to sedate animals and humans for surgery, though it eventually was replaced by medications that worked faster with less risk. Beginning in the 1990s, initially to the puzzlement of police, burglars began breaking into veterinary clinics and stealing Ketamine. They soon learned that recreational drug users had discovered Ketamine and were turning it into the new hallucinogenic party drug. In its standard powdered form, Ketamine looked like cocaine, and could be snorted in the same way. But it also could be easily modified for injecting, smoking or even mixing into drinks.

Whether its cash, gold, or digital-data bits, we all know that money makes the world go round. But what our host, Jake Ward of Popular Science magazine discovers in this one hour special is that without the engines that power the world’s financial systems, that world would grind to a halt. For the first time, National Geographic Channel takes you inside the heart of the money machine to places that you’re not allowed to bring a camera… straight into the vaults of some of the world’s largest stashes of what you want, need, and bust your butt to get: Money.

Over six unforgettable episodes, Nazi Megastructures uncovers the hidden remains of Hitler's most ambitious Megastructures, telling the stories of the engineering geniuses that designed them and revealing how these structures sparked a technological revolution that changed warfare forever.